NDA2013MathematicsTrigonometric Ratios & IdentitiesActual
If A =x+1 and B =x-1 , then x^2 ( ~A - B ) has the value :
Options
- A1
- Bx
- C0
- D2
Correct answer
D. 2
Step-by-step solution
x^2 ( ~A - B 1+ A B )=x^2 ( (x+1)-(x-1) 1+ (x^2-1 ) )=x^2 ( 2 x^2 )=2